1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. |
4 | */ |
5 | |
6 | #include <linux/iversion.h> |
7 | #include <linux/namei.h> |
8 | #include <linux/slab.h> |
9 | #include <linux/buffer_head.h> |
10 | #include <linux/nls.h> |
11 | |
12 | #include "exfat_raw.h" |
13 | #include "exfat_fs.h" |
14 | |
15 | static inline unsigned long exfat_d_version(struct dentry *dentry) |
16 | { |
17 | return (unsigned long) dentry->d_fsdata; |
18 | } |
19 | |
20 | static inline void exfat_d_version_set(struct dentry *dentry, |
21 | unsigned long version) |
22 | { |
23 | dentry->d_fsdata = (void *) version; |
24 | } |
25 | |
26 | /* |
27 | * If new entry was created in the parent, it could create the 8.3 alias (the |
28 | * shortname of logname). So, the parent may have the negative-dentry which |
29 | * matches the created 8.3 alias. |
30 | * |
31 | * If it happened, the negative dentry isn't actually negative anymore. So, |
32 | * drop it. |
33 | */ |
34 | static int exfat_d_revalidate(struct dentry *dentry, unsigned int flags) |
35 | { |
36 | int ret; |
37 | |
38 | if (flags & LOOKUP_RCU) |
39 | return -ECHILD; |
40 | |
41 | /* |
42 | * This is not negative dentry. Always valid. |
43 | * |
44 | * Note, rename() to existing directory entry will have ->d_inode, and |
45 | * will use existing name which isn't specified name by user. |
46 | * |
47 | * We may be able to drop this positive dentry here. But dropping |
48 | * positive dentry isn't good idea. So it's unsupported like |
49 | * rename("filename", "FILENAME") for now. |
50 | */ |
51 | if (d_really_is_positive(dentry)) |
52 | return 1; |
53 | |
54 | /* |
55 | * Drop the negative dentry, in order to make sure to use the case |
56 | * sensitive name which is specified by user if this is for creation. |
57 | */ |
58 | if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) |
59 | return 0; |
60 | |
61 | spin_lock(lock: &dentry->d_lock); |
62 | ret = inode_eq_iversion(inode: d_inode(dentry: dentry->d_parent), |
63 | old: exfat_d_version(dentry)); |
64 | spin_unlock(lock: &dentry->d_lock); |
65 | return ret; |
66 | } |
67 | |
68 | /* returns the length of a struct qstr, ignoring trailing dots if necessary */ |
69 | static unsigned int exfat_striptail_len(unsigned int len, const char *name, |
70 | bool keep_last_dots) |
71 | { |
72 | if (!keep_last_dots) { |
73 | while (len && name[len - 1] == '.') |
74 | len--; |
75 | } |
76 | return len; |
77 | } |
78 | |
79 | /* |
80 | * Compute the hash for the exfat name corresponding to the dentry. If the name |
81 | * is invalid, we leave the hash code unchanged so that the existing dentry can |
82 | * be used. The exfat fs routines will return ENOENT or EINVAL as appropriate. |
83 | */ |
84 | static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr) |
85 | { |
86 | struct super_block *sb = dentry->d_sb; |
87 | struct nls_table *t = EXFAT_SB(sb)->nls_io; |
88 | const unsigned char *name = qstr->name; |
89 | unsigned int len = exfat_striptail_len(len: qstr->len, name: qstr->name, |
90 | keep_last_dots: EXFAT_SB(sb)->options.keep_last_dots); |
91 | unsigned long hash = init_name_hash(dentry); |
92 | int i, charlen; |
93 | wchar_t c; |
94 | |
95 | for (i = 0; i < len; i += charlen) { |
96 | charlen = t->char2uni(&name[i], len - i, &c); |
97 | if (charlen < 0) |
98 | return charlen; |
99 | hash = partial_name_hash(c: exfat_toupper(sb, a: c), prevhash: hash); |
100 | } |
101 | |
102 | qstr->hash = end_name_hash(hash); |
103 | return 0; |
104 | } |
105 | |
106 | static int exfat_d_cmp(const struct dentry *dentry, unsigned int len, |
107 | const char *str, const struct qstr *name) |
108 | { |
109 | struct super_block *sb = dentry->d_sb; |
110 | struct nls_table *t = EXFAT_SB(sb)->nls_io; |
111 | unsigned int alen = exfat_striptail_len(len: name->len, name: name->name, |
112 | keep_last_dots: EXFAT_SB(sb)->options.keep_last_dots); |
113 | unsigned int blen = exfat_striptail_len(len, name: str, |
114 | keep_last_dots: EXFAT_SB(sb)->options.keep_last_dots); |
115 | wchar_t c1, c2; |
116 | int charlen, i; |
117 | |
118 | if (alen != blen) |
119 | return 1; |
120 | |
121 | for (i = 0; i < len; i += charlen) { |
122 | charlen = t->char2uni(&name->name[i], alen - i, &c1); |
123 | if (charlen < 0) |
124 | return 1; |
125 | if (charlen != t->char2uni(&str[i], blen - i, &c2)) |
126 | return 1; |
127 | |
128 | if (exfat_toupper(sb, a: c1) != exfat_toupper(sb, a: c2)) |
129 | return 1; |
130 | } |
131 | |
132 | return 0; |
133 | } |
134 | |
135 | const struct dentry_operations exfat_dentry_ops = { |
136 | .d_revalidate = exfat_d_revalidate, |
137 | .d_hash = exfat_d_hash, |
138 | .d_compare = exfat_d_cmp, |
139 | }; |
140 | |
141 | static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr) |
142 | { |
143 | struct super_block *sb = dentry->d_sb; |
144 | const unsigned char *name = qstr->name; |
145 | unsigned int len = exfat_striptail_len(len: qstr->len, name: qstr->name, |
146 | keep_last_dots: EXFAT_SB(sb)->options.keep_last_dots); |
147 | unsigned long hash = init_name_hash(dentry); |
148 | int i, charlen; |
149 | unicode_t u; |
150 | |
151 | for (i = 0; i < len; i += charlen) { |
152 | charlen = utf8_to_utf32(s: &name[i], len: len - i, pu: &u); |
153 | if (charlen < 0) |
154 | return charlen; |
155 | |
156 | /* |
157 | * exfat_toupper() works only for code points up to the U+FFFF. |
158 | */ |
159 | hash = partial_name_hash(c: u <= 0xFFFF ? exfat_toupper(sb, a: u) : u, |
160 | prevhash: hash); |
161 | } |
162 | |
163 | qstr->hash = end_name_hash(hash); |
164 | return 0; |
165 | } |
166 | |
167 | static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len, |
168 | const char *str, const struct qstr *name) |
169 | { |
170 | struct super_block *sb = dentry->d_sb; |
171 | unsigned int alen = exfat_striptail_len(len: name->len, name: name->name, |
172 | keep_last_dots: EXFAT_SB(sb)->options.keep_last_dots); |
173 | unsigned int blen = exfat_striptail_len(len, name: str, |
174 | keep_last_dots: EXFAT_SB(sb)->options.keep_last_dots); |
175 | |
176 | unicode_t u_a, u_b; |
177 | int charlen, i; |
178 | |
179 | if (alen != blen) |
180 | return 1; |
181 | |
182 | for (i = 0; i < alen; i += charlen) { |
183 | charlen = utf8_to_utf32(s: &name->name[i], len: alen - i, pu: &u_a); |
184 | if (charlen < 0) |
185 | return 1; |
186 | if (charlen != utf8_to_utf32(s: &str[i], len: blen - i, pu: &u_b)) |
187 | return 1; |
188 | |
189 | if (u_a <= 0xFFFF && u_b <= 0xFFFF) { |
190 | if (exfat_toupper(sb, a: u_a) != exfat_toupper(sb, a: u_b)) |
191 | return 1; |
192 | } else { |
193 | if (u_a != u_b) |
194 | return 1; |
195 | } |
196 | } |
197 | |
198 | return 0; |
199 | } |
200 | |
201 | const struct dentry_operations exfat_utf8_dentry_ops = { |
202 | .d_revalidate = exfat_d_revalidate, |
203 | .d_hash = exfat_utf8_d_hash, |
204 | .d_compare = exfat_utf8_d_cmp, |
205 | }; |
206 | |
207 | /* search EMPTY CONTINUOUS "num_entries" entries */ |
208 | static int exfat_search_empty_slot(struct super_block *sb, |
209 | struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir, |
210 | int num_entries, struct exfat_entry_set_cache *es) |
211 | { |
212 | int i, dentry, ret; |
213 | int dentries_per_clu; |
214 | struct exfat_chain clu; |
215 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
216 | int total_entries = EXFAT_CLU_TO_DEN(p_dir->size, sbi); |
217 | |
218 | dentries_per_clu = sbi->dentries_per_clu; |
219 | |
220 | if (hint_femp->eidx != EXFAT_HINT_NONE) { |
221 | dentry = hint_femp->eidx; |
222 | |
223 | /* |
224 | * If hint_femp->count is enough, it is needed to check if |
225 | * there are actual empty entries. |
226 | * Otherwise, and if "dentry + hint_famp->count" is also equal |
227 | * to "p_dir->size * dentries_per_clu", it means ENOSPC. |
228 | */ |
229 | if (dentry + hint_femp->count == total_entries && |
230 | num_entries > hint_femp->count) |
231 | return -ENOSPC; |
232 | |
233 | hint_femp->eidx = EXFAT_HINT_NONE; |
234 | exfat_chain_dup(dup: &clu, ec: &hint_femp->cur); |
235 | } else { |
236 | exfat_chain_dup(dup: &clu, ec: p_dir); |
237 | dentry = 0; |
238 | } |
239 | |
240 | while (dentry + num_entries < total_entries && |
241 | clu.dir != EXFAT_EOF_CLUSTER) { |
242 | i = dentry & (dentries_per_clu - 1); |
243 | |
244 | ret = exfat_get_empty_dentry_set(es, sb, p_dir: &clu, entry: i, num_entries); |
245 | if (ret < 0) |
246 | return ret; |
247 | else if (ret == 0) |
248 | return dentry; |
249 | |
250 | dentry += ret; |
251 | i += ret; |
252 | |
253 | while (i >= dentries_per_clu) { |
254 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { |
255 | if (--clu.size > 0) |
256 | clu.dir++; |
257 | else |
258 | clu.dir = EXFAT_EOF_CLUSTER; |
259 | } else { |
260 | if (exfat_get_next_cluster(sb, &clu.dir)) |
261 | return -EIO; |
262 | } |
263 | |
264 | i -= dentries_per_clu; |
265 | } |
266 | } |
267 | |
268 | hint_femp->eidx = dentry; |
269 | hint_femp->count = 0; |
270 | if (dentry == total_entries || clu.dir == EXFAT_EOF_CLUSTER) |
271 | exfat_chain_set(ec: &hint_femp->cur, EXFAT_EOF_CLUSTER, size: 0, |
272 | flags: clu.flags); |
273 | else |
274 | hint_femp->cur = clu; |
275 | |
276 | return -ENOSPC; |
277 | } |
278 | |
279 | static int exfat_check_max_dentries(struct inode *inode) |
280 | { |
281 | if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) { |
282 | /* |
283 | * exFAT spec allows a dir to grow up to 8388608(256MB) |
284 | * dentries |
285 | */ |
286 | return -ENOSPC; |
287 | } |
288 | return 0; |
289 | } |
290 | |
291 | /* find empty directory entry. |
292 | * if there isn't any empty slot, expand cluster chain. |
293 | */ |
294 | static int exfat_find_empty_entry(struct inode *inode, |
295 | struct exfat_chain *p_dir, int num_entries, |
296 | struct exfat_entry_set_cache *es) |
297 | { |
298 | int dentry; |
299 | unsigned int ret, last_clu; |
300 | loff_t size = 0; |
301 | struct exfat_chain clu; |
302 | struct super_block *sb = inode->i_sb; |
303 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
304 | struct exfat_inode_info *ei = EXFAT_I(inode); |
305 | struct exfat_hint_femp hint_femp; |
306 | |
307 | hint_femp.eidx = EXFAT_HINT_NONE; |
308 | |
309 | if (ei->hint_femp.eidx != EXFAT_HINT_NONE) { |
310 | hint_femp = ei->hint_femp; |
311 | ei->hint_femp.eidx = EXFAT_HINT_NONE; |
312 | } |
313 | |
314 | while ((dentry = exfat_search_empty_slot(sb, hint_femp: &hint_femp, p_dir, |
315 | num_entries, es)) < 0) { |
316 | if (dentry == -EIO) |
317 | break; |
318 | |
319 | if (exfat_check_max_dentries(inode)) |
320 | return -ENOSPC; |
321 | |
322 | /* |
323 | * Allocate new cluster to this directory |
324 | */ |
325 | if (ei->start_clu != EXFAT_EOF_CLUSTER) { |
326 | /* we trust p_dir->size regardless of FAT type */ |
327 | if (exfat_find_last_cluster(sb, p_chain: p_dir, ret_clu: &last_clu)) |
328 | return -EIO; |
329 | |
330 | exfat_chain_set(ec: &clu, dir: last_clu + 1, size: 0, flags: p_dir->flags); |
331 | } else { |
332 | /* This directory is empty */ |
333 | exfat_chain_set(ec: &clu, EXFAT_EOF_CLUSTER, size: 0, |
334 | ALLOC_NO_FAT_CHAIN); |
335 | } |
336 | |
337 | /* allocate a cluster */ |
338 | ret = exfat_alloc_cluster(inode, num_alloc: 1, p_chain: &clu, IS_DIRSYNC(inode)); |
339 | if (ret) |
340 | return ret; |
341 | |
342 | if (exfat_zeroed_cluster(dir: inode, clu: clu.dir)) |
343 | return -EIO; |
344 | |
345 | if (ei->start_clu == EXFAT_EOF_CLUSTER) { |
346 | ei->start_clu = clu.dir; |
347 | p_dir->dir = clu.dir; |
348 | } |
349 | |
350 | /* append to the FAT chain */ |
351 | if (clu.flags != p_dir->flags) { |
352 | /* no-fat-chain bit is disabled, |
353 | * so fat-chain should be synced with alloc-bitmap |
354 | */ |
355 | exfat_chain_cont_cluster(sb, chain: p_dir->dir, len: p_dir->size); |
356 | p_dir->flags = ALLOC_FAT_CHAIN; |
357 | hint_femp.cur.flags = ALLOC_FAT_CHAIN; |
358 | } |
359 | |
360 | if (clu.flags == ALLOC_FAT_CHAIN) |
361 | if (exfat_ent_set(sb, loc: last_clu, content: clu.dir)) |
362 | return -EIO; |
363 | |
364 | if (hint_femp.cur.dir == EXFAT_EOF_CLUSTER) |
365 | exfat_chain_set(ec: &hint_femp.cur, dir: clu.dir, size: 0, flags: clu.flags); |
366 | |
367 | hint_femp.count += sbi->dentries_per_clu; |
368 | |
369 | hint_femp.cur.size++; |
370 | p_dir->size++; |
371 | size = EXFAT_CLU_TO_B(p_dir->size, sbi); |
372 | |
373 | /* directory inode should be updated in here */ |
374 | i_size_write(inode, i_size: size); |
375 | ei->i_size_ondisk += sbi->cluster_size; |
376 | ei->i_size_aligned += sbi->cluster_size; |
377 | ei->valid_size += sbi->cluster_size; |
378 | ei->flags = p_dir->flags; |
379 | inode->i_blocks += sbi->cluster_size >> 9; |
380 | } |
381 | |
382 | return dentry; |
383 | } |
384 | |
385 | /* |
386 | * Name Resolution Functions : |
387 | * Zero if it was successful; otherwise nonzero. |
388 | */ |
389 | static int __exfat_resolve_path(struct inode *inode, const unsigned char *path, |
390 | struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, |
391 | int lookup) |
392 | { |
393 | int namelen; |
394 | int lossy = NLS_NAME_NO_LOSSY; |
395 | struct super_block *sb = inode->i_sb; |
396 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
397 | struct exfat_inode_info *ei = EXFAT_I(inode); |
398 | int pathlen = strlen(path); |
399 | |
400 | /* |
401 | * get the length of the pathname excluding |
402 | * trailing periods, if any. |
403 | */ |
404 | namelen = exfat_striptail_len(len: pathlen, name: path, keep_last_dots: false); |
405 | if (EXFAT_SB(sb)->options.keep_last_dots) { |
406 | /* |
407 | * Do not allow the creation of files with names |
408 | * ending with period(s). |
409 | */ |
410 | if (!lookup && (namelen < pathlen)) |
411 | return -EINVAL; |
412 | namelen = pathlen; |
413 | } |
414 | if (!namelen) |
415 | return -ENOENT; |
416 | if (pathlen > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE)) |
417 | return -ENAMETOOLONG; |
418 | |
419 | /* |
420 | * strip all leading spaces : |
421 | * "MS windows 7" supports leading spaces. |
422 | * So we should skip this preprocessing for compatibility. |
423 | */ |
424 | |
425 | /* file name conversion : |
426 | * If lookup case, we allow bad-name for compatibility. |
427 | */ |
428 | namelen = exfat_nls_to_utf16(sb, p_cstring: path, len: namelen, uniname: p_uniname, |
429 | p_lossy: &lossy); |
430 | if (namelen < 0) |
431 | return namelen; /* return error value */ |
432 | |
433 | if ((lossy && !lookup) || !namelen) |
434 | return (lossy & NLS_NAME_OVERLEN) ? -ENAMETOOLONG : -EINVAL; |
435 | |
436 | exfat_chain_set(ec: p_dir, dir: ei->start_clu, |
437 | EXFAT_B_TO_CLU(i_size_read(inode), sbi), flags: ei->flags); |
438 | |
439 | return 0; |
440 | } |
441 | |
442 | static inline int exfat_resolve_path(struct inode *inode, |
443 | const unsigned char *path, struct exfat_chain *dir, |
444 | struct exfat_uni_name *uni) |
445 | { |
446 | return __exfat_resolve_path(inode, path, p_dir: dir, p_uniname: uni, lookup: 0); |
447 | } |
448 | |
449 | static inline int exfat_resolve_path_for_lookup(struct inode *inode, |
450 | const unsigned char *path, struct exfat_chain *dir, |
451 | struct exfat_uni_name *uni) |
452 | { |
453 | return __exfat_resolve_path(inode, path, p_dir: dir, p_uniname: uni, lookup: 1); |
454 | } |
455 | |
456 | static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info) |
457 | { |
458 | return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff); |
459 | } |
460 | |
461 | static int exfat_add_entry(struct inode *inode, const char *path, |
462 | struct exfat_chain *p_dir, unsigned int type, |
463 | struct exfat_dir_entry *info) |
464 | { |
465 | int ret, dentry, num_entries; |
466 | struct super_block *sb = inode->i_sb; |
467 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
468 | struct exfat_uni_name uniname; |
469 | struct exfat_chain clu; |
470 | struct timespec64 ts = current_time(inode); |
471 | struct exfat_entry_set_cache es; |
472 | int clu_size = 0; |
473 | unsigned int start_clu = EXFAT_FREE_CLUSTER; |
474 | |
475 | ret = exfat_resolve_path(inode, path, dir: p_dir, uni: &uniname); |
476 | if (ret) |
477 | goto out; |
478 | |
479 | num_entries = exfat_calc_num_entries(p_uniname: &uniname); |
480 | if (num_entries < 0) { |
481 | ret = num_entries; |
482 | goto out; |
483 | } |
484 | |
485 | /* exfat_find_empty_entry must be called before alloc_cluster() */ |
486 | dentry = exfat_find_empty_entry(inode, p_dir, num_entries, es: &es); |
487 | if (dentry < 0) { |
488 | ret = dentry; /* -EIO or -ENOSPC */ |
489 | goto out; |
490 | } |
491 | |
492 | if (type == TYPE_DIR && !sbi->options.zero_size_dir) { |
493 | ret = exfat_alloc_new_dir(inode, clu: &clu); |
494 | if (ret) { |
495 | exfat_put_dentry_set(es: &es, sync: false); |
496 | goto out; |
497 | } |
498 | start_clu = clu.dir; |
499 | clu_size = sbi->cluster_size; |
500 | } |
501 | |
502 | /* update the directory entry */ |
503 | /* fill the dos name directory entry information of the created file. |
504 | * the first cluster is not determined yet. (0) |
505 | */ |
506 | exfat_init_dir_entry(es: &es, type, start_clu, size: clu_size, ts: &ts); |
507 | exfat_init_ext_entry(es: &es, num_entries, p_uniname: &uniname); |
508 | |
509 | ret = exfat_put_dentry_set(es: &es, IS_DIRSYNC(inode)); |
510 | if (ret) |
511 | goto out; |
512 | |
513 | info->dir = *p_dir; |
514 | info->entry = dentry; |
515 | info->flags = ALLOC_NO_FAT_CHAIN; |
516 | info->type = type; |
517 | |
518 | if (type == TYPE_FILE) { |
519 | info->attr = EXFAT_ATTR_ARCHIVE; |
520 | info->start_clu = EXFAT_EOF_CLUSTER; |
521 | info->size = 0; |
522 | info->num_subdirs = 0; |
523 | } else { |
524 | info->attr = EXFAT_ATTR_SUBDIR; |
525 | if (sbi->options.zero_size_dir) |
526 | info->start_clu = EXFAT_EOF_CLUSTER; |
527 | else |
528 | info->start_clu = start_clu; |
529 | info->size = clu_size; |
530 | info->num_subdirs = EXFAT_MIN_SUBDIR; |
531 | } |
532 | info->valid_size = info->size; |
533 | |
534 | memset(&info->crtime, 0, sizeof(info->crtime)); |
535 | memset(&info->mtime, 0, sizeof(info->mtime)); |
536 | memset(&info->atime, 0, sizeof(info->atime)); |
537 | out: |
538 | return ret; |
539 | } |
540 | |
541 | static int exfat_create(struct mnt_idmap *idmap, struct inode *dir, |
542 | struct dentry *dentry, umode_t mode, bool excl) |
543 | { |
544 | struct super_block *sb = dir->i_sb; |
545 | struct inode *inode; |
546 | struct exfat_chain cdir; |
547 | struct exfat_dir_entry info; |
548 | loff_t i_pos; |
549 | int err; |
550 | loff_t size = i_size_read(inode: dir); |
551 | |
552 | mutex_lock(&EXFAT_SB(sb)->s_lock); |
553 | exfat_set_volume_dirty(sb); |
554 | err = exfat_add_entry(inode: dir, path: dentry->d_name.name, p_dir: &cdir, TYPE_FILE, |
555 | info: &info); |
556 | if (err) |
557 | goto unlock; |
558 | |
559 | inode_inc_iversion(inode: dir); |
560 | inode_set_mtime_to_ts(inode: dir, ts: inode_set_ctime_current(inode: dir)); |
561 | if (IS_DIRSYNC(dir) && size != i_size_read(inode: dir)) |
562 | exfat_sync_inode(inode: dir); |
563 | else |
564 | mark_inode_dirty(inode: dir); |
565 | |
566 | i_pos = exfat_make_i_pos(info: &info); |
567 | inode = exfat_build_inode(sb, info: &info, i_pos); |
568 | err = PTR_ERR_OR_ZERO(ptr: inode); |
569 | if (err) |
570 | goto unlock; |
571 | |
572 | inode_inc_iversion(inode); |
573 | EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode); |
574 | exfat_truncate_inode_atime(inode); |
575 | |
576 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ |
577 | |
578 | d_instantiate(dentry, inode); |
579 | unlock: |
580 | mutex_unlock(lock: &EXFAT_SB(sb)->s_lock); |
581 | return err; |
582 | } |
583 | |
584 | /* lookup a file */ |
585 | static int exfat_find(struct inode *dir, struct qstr *qname, |
586 | struct exfat_dir_entry *info) |
587 | { |
588 | int ret, dentry, count; |
589 | struct exfat_chain cdir; |
590 | struct exfat_uni_name uni_name; |
591 | struct super_block *sb = dir->i_sb; |
592 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
593 | struct exfat_inode_info *ei = EXFAT_I(inode: dir); |
594 | struct exfat_dentry *ep, *ep2; |
595 | struct exfat_entry_set_cache es; |
596 | /* for optimized dir & entry to prevent long traverse of cluster chain */ |
597 | struct exfat_hint hint_opt; |
598 | |
599 | if (qname->len == 0) |
600 | return -ENOENT; |
601 | |
602 | /* check the validity of directory name in the given pathname */ |
603 | ret = exfat_resolve_path_for_lookup(inode: dir, path: qname->name, dir: &cdir, uni: &uni_name); |
604 | if (ret) |
605 | return ret; |
606 | |
607 | /* check the validation of hint_stat and initialize it if required */ |
608 | if (ei->version != (inode_peek_iversion_raw(inode: dir) & 0xffffffff)) { |
609 | ei->hint_stat.clu = cdir.dir; |
610 | ei->hint_stat.eidx = 0; |
611 | ei->version = (inode_peek_iversion_raw(inode: dir) & 0xffffffff); |
612 | ei->hint_femp.eidx = EXFAT_HINT_NONE; |
613 | } |
614 | |
615 | /* search the file name for directories */ |
616 | dentry = exfat_find_dir_entry(sb, ei, p_dir: &cdir, p_uniname: &uni_name, hint_opt: &hint_opt); |
617 | if (dentry < 0) |
618 | return dentry; /* -error value */ |
619 | |
620 | info->dir = cdir; |
621 | info->entry = dentry; |
622 | info->num_subdirs = 0; |
623 | |
624 | /* adjust cdir to the optimized value */ |
625 | cdir.dir = hint_opt.clu; |
626 | if (cdir.flags & ALLOC_NO_FAT_CHAIN) |
627 | cdir.size -= dentry / sbi->dentries_per_clu; |
628 | dentry = hint_opt.eidx; |
629 | if (exfat_get_dentry_set(es: &es, sb, p_dir: &cdir, entry: dentry, ES_2_ENTRIES)) |
630 | return -EIO; |
631 | ep = exfat_get_dentry_cached(es: &es, ES_IDX_FILE); |
632 | ep2 = exfat_get_dentry_cached(es: &es, ES_IDX_STREAM); |
633 | |
634 | info->type = exfat_get_entry_type(p_entry: ep); |
635 | info->attr = le16_to_cpu(ep->dentry.file.attr); |
636 | info->size = le64_to_cpu(ep2->dentry.stream.valid_size); |
637 | info->valid_size = le64_to_cpu(ep2->dentry.stream.valid_size); |
638 | info->size = le64_to_cpu(ep2->dentry.stream.size); |
639 | if (info->size == 0) { |
640 | info->flags = ALLOC_NO_FAT_CHAIN; |
641 | info->start_clu = EXFAT_EOF_CLUSTER; |
642 | } else { |
643 | info->flags = ep2->dentry.stream.flags; |
644 | info->start_clu = |
645 | le32_to_cpu(ep2->dentry.stream.start_clu); |
646 | } |
647 | |
648 | exfat_get_entry_time(sbi, ts: &info->crtime, |
649 | tz: ep->dentry.file.create_tz, |
650 | time: ep->dentry.file.create_time, |
651 | date: ep->dentry.file.create_date, |
652 | time_cs: ep->dentry.file.create_time_cs); |
653 | exfat_get_entry_time(sbi, ts: &info->mtime, |
654 | tz: ep->dentry.file.modify_tz, |
655 | time: ep->dentry.file.modify_time, |
656 | date: ep->dentry.file.modify_date, |
657 | time_cs: ep->dentry.file.modify_time_cs); |
658 | exfat_get_entry_time(sbi, ts: &info->atime, |
659 | tz: ep->dentry.file.access_tz, |
660 | time: ep->dentry.file.access_time, |
661 | date: ep->dentry.file.access_date, |
662 | time_cs: 0); |
663 | exfat_put_dentry_set(es: &es, sync: false); |
664 | |
665 | if (ei->start_clu == EXFAT_FREE_CLUSTER) { |
666 | exfat_fs_error(sb, |
667 | "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)" , |
668 | i_size_read(dir), ei->dir.dir, ei->entry); |
669 | return -EIO; |
670 | } |
671 | |
672 | if (info->type == TYPE_DIR) { |
673 | exfat_chain_set(ec: &cdir, dir: info->start_clu, |
674 | EXFAT_B_TO_CLU(info->size, sbi), flags: info->flags); |
675 | count = exfat_count_dir_entries(sb, p_dir: &cdir); |
676 | if (count < 0) |
677 | return -EIO; |
678 | |
679 | info->num_subdirs = count + EXFAT_MIN_SUBDIR; |
680 | } |
681 | return 0; |
682 | } |
683 | |
684 | static int exfat_d_anon_disconn(struct dentry *dentry) |
685 | { |
686 | return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); |
687 | } |
688 | |
689 | static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry, |
690 | unsigned int flags) |
691 | { |
692 | struct super_block *sb = dir->i_sb; |
693 | struct inode *inode; |
694 | struct dentry *alias; |
695 | struct exfat_dir_entry info; |
696 | int err; |
697 | loff_t i_pos; |
698 | mode_t i_mode; |
699 | |
700 | mutex_lock(&EXFAT_SB(sb)->s_lock); |
701 | err = exfat_find(dir, qname: &dentry->d_name, info: &info); |
702 | if (err) { |
703 | if (err == -ENOENT) { |
704 | inode = NULL; |
705 | goto out; |
706 | } |
707 | goto unlock; |
708 | } |
709 | |
710 | i_pos = exfat_make_i_pos(info: &info); |
711 | inode = exfat_build_inode(sb, info: &info, i_pos); |
712 | err = PTR_ERR_OR_ZERO(ptr: inode); |
713 | if (err) |
714 | goto unlock; |
715 | |
716 | i_mode = inode->i_mode; |
717 | alias = d_find_alias(inode); |
718 | |
719 | /* |
720 | * Checking "alias->d_parent == dentry->d_parent" to make sure |
721 | * FS is not corrupted (especially double linked dir). |
722 | */ |
723 | if (alias && alias->d_parent == dentry->d_parent && |
724 | !exfat_d_anon_disconn(dentry: alias)) { |
725 | |
726 | /* |
727 | * Unhashed alias is able to exist because of revalidate() |
728 | * called by lookup_fast. You can easily make this status |
729 | * by calling create and lookup concurrently |
730 | * In such case, we reuse an alias instead of new dentry |
731 | */ |
732 | if (d_unhashed(dentry: alias)) { |
733 | WARN_ON(alias->d_name.hash_len != |
734 | dentry->d_name.hash_len); |
735 | exfat_info(sb, "rehashed a dentry(%p) in read lookup" , |
736 | alias); |
737 | d_drop(dentry); |
738 | d_rehash(alias); |
739 | } else if (!S_ISDIR(i_mode)) { |
740 | /* |
741 | * This inode has non anonymous-DCACHE_DISCONNECTED |
742 | * dentry. This means, the user did ->lookup() by an |
743 | * another name (longname vs 8.3 alias of it) in past. |
744 | * |
745 | * Switch to new one for reason of locality if possible. |
746 | */ |
747 | d_move(alias, dentry); |
748 | } |
749 | iput(inode); |
750 | mutex_unlock(lock: &EXFAT_SB(sb)->s_lock); |
751 | return alias; |
752 | } |
753 | dput(alias); |
754 | out: |
755 | mutex_unlock(lock: &EXFAT_SB(sb)->s_lock); |
756 | if (!inode) |
757 | exfat_d_version_set(dentry, version: inode_query_iversion(inode: dir)); |
758 | |
759 | return d_splice_alias(inode, dentry); |
760 | unlock: |
761 | mutex_unlock(lock: &EXFAT_SB(sb)->s_lock); |
762 | return ERR_PTR(error: err); |
763 | } |
764 | |
765 | /* remove an entry, BUT don't truncate */ |
766 | static int exfat_unlink(struct inode *dir, struct dentry *dentry) |
767 | { |
768 | struct exfat_chain cdir; |
769 | struct super_block *sb = dir->i_sb; |
770 | struct inode *inode = dentry->d_inode; |
771 | struct exfat_inode_info *ei = EXFAT_I(inode); |
772 | struct exfat_entry_set_cache es; |
773 | int entry, err = 0; |
774 | |
775 | mutex_lock(&EXFAT_SB(sb)->s_lock); |
776 | exfat_chain_dup(dup: &cdir, ec: &ei->dir); |
777 | entry = ei->entry; |
778 | if (ei->dir.dir == DIR_DELETED) { |
779 | exfat_err(sb, "abnormal access to deleted dentry" ); |
780 | err = -ENOENT; |
781 | goto unlock; |
782 | } |
783 | |
784 | err = exfat_get_dentry_set(es: &es, sb, p_dir: &cdir, entry, ES_ALL_ENTRIES); |
785 | if (err) { |
786 | err = -EIO; |
787 | goto unlock; |
788 | } |
789 | |
790 | exfat_set_volume_dirty(sb); |
791 | |
792 | /* update the directory entry */ |
793 | exfat_remove_entries(inode, es: &es, ES_IDX_FILE); |
794 | |
795 | err = exfat_put_dentry_set(es: &es, IS_DIRSYNC(inode)); |
796 | if (err) |
797 | goto unlock; |
798 | |
799 | /* This doesn't modify ei */ |
800 | ei->dir.dir = DIR_DELETED; |
801 | |
802 | inode_inc_iversion(inode: dir); |
803 | simple_inode_init_ts(inode: dir); |
804 | exfat_truncate_inode_atime(inode: dir); |
805 | mark_inode_dirty(inode: dir); |
806 | |
807 | clear_nlink(inode); |
808 | simple_inode_init_ts(inode); |
809 | exfat_truncate_inode_atime(inode); |
810 | exfat_unhash_inode(inode); |
811 | exfat_d_version_set(dentry, version: inode_query_iversion(inode: dir)); |
812 | unlock: |
813 | mutex_unlock(lock: &EXFAT_SB(sb)->s_lock); |
814 | return err; |
815 | } |
816 | |
817 | static int exfat_mkdir(struct mnt_idmap *idmap, struct inode *dir, |
818 | struct dentry *dentry, umode_t mode) |
819 | { |
820 | struct super_block *sb = dir->i_sb; |
821 | struct inode *inode; |
822 | struct exfat_dir_entry info; |
823 | struct exfat_chain cdir; |
824 | loff_t i_pos; |
825 | int err; |
826 | loff_t size = i_size_read(inode: dir); |
827 | |
828 | mutex_lock(&EXFAT_SB(sb)->s_lock); |
829 | exfat_set_volume_dirty(sb); |
830 | err = exfat_add_entry(inode: dir, path: dentry->d_name.name, p_dir: &cdir, TYPE_DIR, |
831 | info: &info); |
832 | if (err) |
833 | goto unlock; |
834 | |
835 | inode_inc_iversion(inode: dir); |
836 | inode_set_mtime_to_ts(inode: dir, ts: inode_set_ctime_current(inode: dir)); |
837 | if (IS_DIRSYNC(dir) && size != i_size_read(inode: dir)) |
838 | exfat_sync_inode(inode: dir); |
839 | else |
840 | mark_inode_dirty(inode: dir); |
841 | inc_nlink(inode: dir); |
842 | |
843 | i_pos = exfat_make_i_pos(info: &info); |
844 | inode = exfat_build_inode(sb, info: &info, i_pos); |
845 | err = PTR_ERR_OR_ZERO(ptr: inode); |
846 | if (err) |
847 | goto unlock; |
848 | |
849 | inode_inc_iversion(inode); |
850 | EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode); |
851 | exfat_truncate_inode_atime(inode); |
852 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ |
853 | |
854 | d_instantiate(dentry, inode); |
855 | |
856 | unlock: |
857 | mutex_unlock(lock: &EXFAT_SB(sb)->s_lock); |
858 | return err; |
859 | } |
860 | |
861 | static int exfat_check_dir_empty(struct super_block *sb, |
862 | struct exfat_chain *p_dir) |
863 | { |
864 | int i, dentries_per_clu; |
865 | unsigned int type; |
866 | struct exfat_chain clu; |
867 | struct exfat_dentry *ep; |
868 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
869 | struct buffer_head *bh; |
870 | |
871 | dentries_per_clu = sbi->dentries_per_clu; |
872 | |
873 | if (p_dir->dir == EXFAT_EOF_CLUSTER) |
874 | return 0; |
875 | |
876 | exfat_chain_dup(dup: &clu, ec: p_dir); |
877 | |
878 | while (clu.dir != EXFAT_EOF_CLUSTER) { |
879 | for (i = 0; i < dentries_per_clu; i++) { |
880 | ep = exfat_get_dentry(sb, p_dir: &clu, entry: i, bh: &bh); |
881 | if (!ep) |
882 | return -EIO; |
883 | type = exfat_get_entry_type(p_entry: ep); |
884 | brelse(bh); |
885 | if (type == TYPE_UNUSED) |
886 | return 0; |
887 | |
888 | if (type != TYPE_FILE && type != TYPE_DIR) |
889 | continue; |
890 | |
891 | return -ENOTEMPTY; |
892 | } |
893 | |
894 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { |
895 | if (--clu.size > 0) |
896 | clu.dir++; |
897 | else |
898 | clu.dir = EXFAT_EOF_CLUSTER; |
899 | } else { |
900 | if (exfat_get_next_cluster(sb, &(clu.dir))) |
901 | return -EIO; |
902 | } |
903 | } |
904 | |
905 | return 0; |
906 | } |
907 | |
908 | static int exfat_rmdir(struct inode *dir, struct dentry *dentry) |
909 | { |
910 | struct inode *inode = dentry->d_inode; |
911 | struct exfat_chain cdir, clu_to_free; |
912 | struct super_block *sb = inode->i_sb; |
913 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
914 | struct exfat_inode_info *ei = EXFAT_I(inode); |
915 | struct exfat_entry_set_cache es; |
916 | int entry, err; |
917 | |
918 | mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock); |
919 | |
920 | exfat_chain_dup(dup: &cdir, ec: &ei->dir); |
921 | entry = ei->entry; |
922 | |
923 | if (ei->dir.dir == DIR_DELETED) { |
924 | exfat_err(sb, "abnormal access to deleted dentry" ); |
925 | err = -ENOENT; |
926 | goto unlock; |
927 | } |
928 | |
929 | exfat_chain_set(ec: &clu_to_free, dir: ei->start_clu, |
930 | EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), flags: ei->flags); |
931 | |
932 | err = exfat_check_dir_empty(sb, p_dir: &clu_to_free); |
933 | if (err) { |
934 | if (err == -EIO) |
935 | exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)" , |
936 | err); |
937 | goto unlock; |
938 | } |
939 | |
940 | err = exfat_get_dentry_set(es: &es, sb, p_dir: &cdir, entry, ES_ALL_ENTRIES); |
941 | if (err) { |
942 | err = -EIO; |
943 | goto unlock; |
944 | } |
945 | |
946 | exfat_set_volume_dirty(sb); |
947 | |
948 | exfat_remove_entries(inode, es: &es, ES_IDX_FILE); |
949 | |
950 | err = exfat_put_dentry_set(es: &es, IS_DIRSYNC(dir)); |
951 | if (err) |
952 | goto unlock; |
953 | |
954 | ei->dir.dir = DIR_DELETED; |
955 | |
956 | inode_inc_iversion(inode: dir); |
957 | simple_inode_init_ts(inode: dir); |
958 | exfat_truncate_inode_atime(inode: dir); |
959 | if (IS_DIRSYNC(dir)) |
960 | exfat_sync_inode(inode: dir); |
961 | else |
962 | mark_inode_dirty(inode: dir); |
963 | drop_nlink(inode: dir); |
964 | |
965 | clear_nlink(inode); |
966 | simple_inode_init_ts(inode); |
967 | exfat_truncate_inode_atime(inode); |
968 | exfat_unhash_inode(inode); |
969 | exfat_d_version_set(dentry, version: inode_query_iversion(inode: dir)); |
970 | unlock: |
971 | mutex_unlock(lock: &EXFAT_SB(sb: inode->i_sb)->s_lock); |
972 | return err; |
973 | } |
974 | |
975 | static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir, |
976 | int oldentry, struct exfat_uni_name *p_uniname, |
977 | struct exfat_inode_info *ei) |
978 | { |
979 | int ret, num_new_entries; |
980 | struct exfat_dentry *epold, *epnew; |
981 | struct super_block *sb = inode->i_sb; |
982 | struct exfat_entry_set_cache old_es, new_es; |
983 | int sync = IS_DIRSYNC(inode); |
984 | |
985 | num_new_entries = exfat_calc_num_entries(p_uniname); |
986 | if (num_new_entries < 0) |
987 | return num_new_entries; |
988 | |
989 | ret = exfat_get_dentry_set(es: &old_es, sb, p_dir, entry: oldentry, ES_ALL_ENTRIES); |
990 | if (ret) { |
991 | ret = -EIO; |
992 | return ret; |
993 | } |
994 | |
995 | epold = exfat_get_dentry_cached(es: &old_es, ES_IDX_FILE); |
996 | |
997 | if (old_es.num_entries < num_new_entries) { |
998 | int newentry; |
999 | |
1000 | newentry = exfat_find_empty_entry(inode, p_dir, num_entries: num_new_entries, |
1001 | es: &new_es); |
1002 | if (newentry < 0) { |
1003 | ret = newentry; /* -EIO or -ENOSPC */ |
1004 | goto put_old_es; |
1005 | } |
1006 | |
1007 | epnew = exfat_get_dentry_cached(es: &new_es, ES_IDX_FILE); |
1008 | *epnew = *epold; |
1009 | if (exfat_get_entry_type(p_entry: epnew) == TYPE_FILE) { |
1010 | epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE); |
1011 | ei->attr |= EXFAT_ATTR_ARCHIVE; |
1012 | } |
1013 | |
1014 | epold = exfat_get_dentry_cached(es: &old_es, ES_IDX_STREAM); |
1015 | epnew = exfat_get_dentry_cached(es: &new_es, ES_IDX_STREAM); |
1016 | *epnew = *epold; |
1017 | |
1018 | exfat_init_ext_entry(es: &new_es, num_entries: num_new_entries, p_uniname); |
1019 | |
1020 | ret = exfat_put_dentry_set(es: &new_es, sync); |
1021 | if (ret) |
1022 | goto put_old_es; |
1023 | |
1024 | exfat_remove_entries(inode, es: &old_es, ES_IDX_FILE); |
1025 | ei->dir = *p_dir; |
1026 | ei->entry = newentry; |
1027 | } else { |
1028 | if (exfat_get_entry_type(p_entry: epold) == TYPE_FILE) { |
1029 | epold->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE); |
1030 | ei->attr |= EXFAT_ATTR_ARCHIVE; |
1031 | } |
1032 | |
1033 | exfat_remove_entries(inode, es: &old_es, ES_IDX_FIRST_FILENAME + 1); |
1034 | exfat_init_ext_entry(es: &old_es, num_entries: num_new_entries, p_uniname); |
1035 | } |
1036 | return exfat_put_dentry_set(es: &old_es, sync); |
1037 | |
1038 | put_old_es: |
1039 | exfat_put_dentry_set(es: &old_es, sync: false); |
1040 | return ret; |
1041 | } |
1042 | |
1043 | static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir, |
1044 | int oldentry, struct exfat_chain *p_newdir, |
1045 | struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei) |
1046 | { |
1047 | int ret, newentry, num_new_entries; |
1048 | struct exfat_dentry *epmov, *epnew; |
1049 | struct super_block *sb = inode->i_sb; |
1050 | struct exfat_entry_set_cache mov_es, new_es; |
1051 | |
1052 | num_new_entries = exfat_calc_num_entries(p_uniname); |
1053 | if (num_new_entries < 0) |
1054 | return num_new_entries; |
1055 | |
1056 | ret = exfat_get_dentry_set(es: &mov_es, sb, p_dir: p_olddir, entry: oldentry, |
1057 | ES_ALL_ENTRIES); |
1058 | if (ret) |
1059 | return -EIO; |
1060 | |
1061 | newentry = exfat_find_empty_entry(inode, p_dir: p_newdir, num_entries: num_new_entries, |
1062 | es: &new_es); |
1063 | if (newentry < 0) { |
1064 | ret = newentry; /* -EIO or -ENOSPC */ |
1065 | goto put_mov_es; |
1066 | } |
1067 | |
1068 | epmov = exfat_get_dentry_cached(es: &mov_es, ES_IDX_FILE); |
1069 | epnew = exfat_get_dentry_cached(es: &new_es, ES_IDX_FILE); |
1070 | *epnew = *epmov; |
1071 | if (exfat_get_entry_type(p_entry: epnew) == TYPE_FILE) { |
1072 | epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE); |
1073 | ei->attr |= EXFAT_ATTR_ARCHIVE; |
1074 | } |
1075 | |
1076 | epmov = exfat_get_dentry_cached(es: &mov_es, ES_IDX_STREAM); |
1077 | epnew = exfat_get_dentry_cached(es: &new_es, ES_IDX_STREAM); |
1078 | *epnew = *epmov; |
1079 | |
1080 | exfat_init_ext_entry(es: &new_es, num_entries: num_new_entries, p_uniname); |
1081 | exfat_remove_entries(inode, es: &mov_es, ES_IDX_FILE); |
1082 | |
1083 | exfat_chain_set(ec: &ei->dir, dir: p_newdir->dir, size: p_newdir->size, |
1084 | flags: p_newdir->flags); |
1085 | |
1086 | ei->entry = newentry; |
1087 | |
1088 | ret = exfat_put_dentry_set(es: &new_es, IS_DIRSYNC(inode)); |
1089 | if (ret) |
1090 | goto put_mov_es; |
1091 | |
1092 | return exfat_put_dentry_set(es: &mov_es, IS_DIRSYNC(inode)); |
1093 | |
1094 | put_mov_es: |
1095 | exfat_put_dentry_set(es: &mov_es, sync: false); |
1096 | |
1097 | return ret; |
1098 | } |
1099 | |
1100 | /* rename or move a old file into a new file */ |
1101 | static int __exfat_rename(struct inode *old_parent_inode, |
1102 | struct exfat_inode_info *ei, struct inode *new_parent_inode, |
1103 | struct dentry *new_dentry) |
1104 | { |
1105 | int ret; |
1106 | int dentry; |
1107 | struct exfat_chain olddir, newdir; |
1108 | struct exfat_chain *p_dir = NULL; |
1109 | struct exfat_uni_name uni_name; |
1110 | struct exfat_dentry *ep; |
1111 | struct super_block *sb = old_parent_inode->i_sb; |
1112 | struct exfat_sb_info *sbi = EXFAT_SB(sb); |
1113 | const unsigned char *new_path = new_dentry->d_name.name; |
1114 | struct inode *new_inode = new_dentry->d_inode; |
1115 | struct exfat_inode_info *new_ei = NULL; |
1116 | unsigned int new_entry_type = TYPE_UNUSED; |
1117 | int new_entry = 0; |
1118 | struct buffer_head *new_bh = NULL; |
1119 | |
1120 | /* check the validity of pointer parameters */ |
1121 | if (new_path == NULL || strlen(new_path) == 0) |
1122 | return -EINVAL; |
1123 | |
1124 | if (ei->dir.dir == DIR_DELETED) { |
1125 | exfat_err(sb, "abnormal access to deleted source dentry" ); |
1126 | return -ENOENT; |
1127 | } |
1128 | |
1129 | exfat_chain_set(ec: &olddir, dir: EXFAT_I(inode: old_parent_inode)->start_clu, |
1130 | EXFAT_B_TO_CLU_ROUND_UP(i_size_read(old_parent_inode), sbi), |
1131 | flags: EXFAT_I(inode: old_parent_inode)->flags); |
1132 | dentry = ei->entry; |
1133 | |
1134 | /* check whether new dir is existing directory and empty */ |
1135 | if (new_inode) { |
1136 | ret = -EIO; |
1137 | new_ei = EXFAT_I(inode: new_inode); |
1138 | |
1139 | if (new_ei->dir.dir == DIR_DELETED) { |
1140 | exfat_err(sb, "abnormal access to deleted target dentry" ); |
1141 | goto out; |
1142 | } |
1143 | |
1144 | p_dir = &(new_ei->dir); |
1145 | new_entry = new_ei->entry; |
1146 | ep = exfat_get_dentry(sb, p_dir, entry: new_entry, bh: &new_bh); |
1147 | if (!ep) |
1148 | goto out; |
1149 | |
1150 | new_entry_type = exfat_get_entry_type(p_entry: ep); |
1151 | brelse(bh: new_bh); |
1152 | |
1153 | /* if new_inode exists, update ei */ |
1154 | if (new_entry_type == TYPE_DIR) { |
1155 | struct exfat_chain new_clu; |
1156 | |
1157 | new_clu.dir = new_ei->start_clu; |
1158 | new_clu.size = |
1159 | EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), |
1160 | sbi); |
1161 | new_clu.flags = new_ei->flags; |
1162 | |
1163 | ret = exfat_check_dir_empty(sb, p_dir: &new_clu); |
1164 | if (ret) |
1165 | goto out; |
1166 | } |
1167 | } |
1168 | |
1169 | /* check the validity of directory name in the given new pathname */ |
1170 | ret = exfat_resolve_path(inode: new_parent_inode, path: new_path, dir: &newdir, |
1171 | uni: &uni_name); |
1172 | if (ret) |
1173 | goto out; |
1174 | |
1175 | exfat_set_volume_dirty(sb); |
1176 | |
1177 | if (olddir.dir == newdir.dir) |
1178 | ret = exfat_rename_file(inode: new_parent_inode, p_dir: &olddir, oldentry: dentry, |
1179 | p_uniname: &uni_name, ei); |
1180 | else |
1181 | ret = exfat_move_file(inode: new_parent_inode, p_olddir: &olddir, oldentry: dentry, |
1182 | p_newdir: &newdir, p_uniname: &uni_name, ei); |
1183 | |
1184 | if (!ret && new_inode) { |
1185 | struct exfat_entry_set_cache es; |
1186 | |
1187 | /* delete entries of new_dir */ |
1188 | ret = exfat_get_dentry_set(es: &es, sb, p_dir, entry: new_entry, |
1189 | ES_ALL_ENTRIES); |
1190 | if (ret) { |
1191 | ret = -EIO; |
1192 | goto del_out; |
1193 | } |
1194 | |
1195 | exfat_remove_entries(inode: new_inode, es: &es, ES_IDX_FILE); |
1196 | |
1197 | ret = exfat_put_dentry_set(es: &es, IS_DIRSYNC(new_inode)); |
1198 | if (ret) |
1199 | goto del_out; |
1200 | |
1201 | /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */ |
1202 | if (new_entry_type == TYPE_DIR && |
1203 | new_ei->start_clu != EXFAT_EOF_CLUSTER) { |
1204 | /* new_ei, new_clu_to_free */ |
1205 | struct exfat_chain new_clu_to_free; |
1206 | |
1207 | exfat_chain_set(ec: &new_clu_to_free, dir: new_ei->start_clu, |
1208 | EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), |
1209 | sbi), flags: new_ei->flags); |
1210 | |
1211 | if (exfat_free_cluster(inode: new_inode, p_chain: &new_clu_to_free)) { |
1212 | /* just set I/O error only */ |
1213 | ret = -EIO; |
1214 | } |
1215 | |
1216 | i_size_write(inode: new_inode, i_size: 0); |
1217 | new_ei->valid_size = 0; |
1218 | new_ei->start_clu = EXFAT_EOF_CLUSTER; |
1219 | new_ei->flags = ALLOC_NO_FAT_CHAIN; |
1220 | } |
1221 | del_out: |
1222 | /* Update new_inode ei |
1223 | * Prevent syncing removed new_inode |
1224 | * (new_ei is already initialized above code ("if (new_inode)") |
1225 | */ |
1226 | new_ei->dir.dir = DIR_DELETED; |
1227 | } |
1228 | out: |
1229 | return ret; |
1230 | } |
1231 | |
1232 | static int exfat_rename(struct mnt_idmap *idmap, |
1233 | struct inode *old_dir, struct dentry *old_dentry, |
1234 | struct inode *new_dir, struct dentry *new_dentry, |
1235 | unsigned int flags) |
1236 | { |
1237 | struct inode *old_inode, *new_inode; |
1238 | struct super_block *sb = old_dir->i_sb; |
1239 | loff_t i_pos; |
1240 | int err; |
1241 | loff_t size = i_size_read(inode: new_dir); |
1242 | |
1243 | /* |
1244 | * The VFS already checks for existence, so for local filesystems |
1245 | * the RENAME_NOREPLACE implementation is equivalent to plain rename. |
1246 | * Don't support any other flags |
1247 | */ |
1248 | if (flags & ~RENAME_NOREPLACE) |
1249 | return -EINVAL; |
1250 | |
1251 | mutex_lock(&EXFAT_SB(sb)->s_lock); |
1252 | old_inode = old_dentry->d_inode; |
1253 | new_inode = new_dentry->d_inode; |
1254 | |
1255 | err = __exfat_rename(old_parent_inode: old_dir, ei: EXFAT_I(inode: old_inode), new_parent_inode: new_dir, new_dentry); |
1256 | if (err) |
1257 | goto unlock; |
1258 | |
1259 | inode_inc_iversion(inode: new_dir); |
1260 | simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry); |
1261 | EXFAT_I(inode: new_dir)->i_crtime = current_time(inode: new_dir); |
1262 | exfat_truncate_inode_atime(inode: new_dir); |
1263 | if (IS_DIRSYNC(new_dir) && size != i_size_read(inode: new_dir)) |
1264 | exfat_sync_inode(inode: new_dir); |
1265 | else |
1266 | mark_inode_dirty(inode: new_dir); |
1267 | |
1268 | i_pos = ((loff_t)EXFAT_I(inode: old_inode)->dir.dir << 32) | |
1269 | (EXFAT_I(inode: old_inode)->entry & 0xffffffff); |
1270 | exfat_unhash_inode(inode: old_inode); |
1271 | exfat_hash_inode(inode: old_inode, i_pos); |
1272 | if (IS_DIRSYNC(new_dir)) |
1273 | exfat_sync_inode(inode: old_inode); |
1274 | else |
1275 | mark_inode_dirty(inode: old_inode); |
1276 | |
1277 | if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { |
1278 | drop_nlink(inode: old_dir); |
1279 | if (!new_inode) |
1280 | inc_nlink(inode: new_dir); |
1281 | } |
1282 | |
1283 | inode_inc_iversion(inode: old_dir); |
1284 | if (new_dir != old_dir) |
1285 | mark_inode_dirty(inode: old_dir); |
1286 | |
1287 | if (new_inode) { |
1288 | exfat_unhash_inode(inode: new_inode); |
1289 | |
1290 | /* skip drop_nlink if new_inode already has been dropped */ |
1291 | if (new_inode->i_nlink) { |
1292 | drop_nlink(inode: new_inode); |
1293 | if (S_ISDIR(new_inode->i_mode)) |
1294 | drop_nlink(inode: new_inode); |
1295 | } else { |
1296 | exfat_warn(sb, "abnormal access to an inode dropped" ); |
1297 | WARN_ON(new_inode->i_nlink == 0); |
1298 | } |
1299 | EXFAT_I(inode: new_inode)->i_crtime = current_time(inode: new_inode); |
1300 | } |
1301 | |
1302 | unlock: |
1303 | mutex_unlock(lock: &EXFAT_SB(sb)->s_lock); |
1304 | return err; |
1305 | } |
1306 | |
1307 | const struct inode_operations exfat_dir_inode_operations = { |
1308 | .create = exfat_create, |
1309 | .lookup = exfat_lookup, |
1310 | .unlink = exfat_unlink, |
1311 | .mkdir = exfat_mkdir, |
1312 | .rmdir = exfat_rmdir, |
1313 | .rename = exfat_rename, |
1314 | .setattr = exfat_setattr, |
1315 | .getattr = exfat_getattr, |
1316 | }; |
1317 | |